These are false-positives. To make you feel more at ease, here are the results of scanning a recent version (of the contents of jwlFusion_windows_amd64.zip) on virustotal.com:

• jwlFusion.exe: https://www.virustotal.com/gui/file/9b7290e212436cefd3894346a7a24f2d6edaeed4cac0f89aac266f486e888531/summary
• jwlCore.dll: https://www.virustotal.com/gui/file/f311f8612c6ddf60e4e15be832b06f561787b61f644fc6d48b6623adf16f30af/summary
• bzip2.dll: https://www.virustotal.com/gui/file/da25db24809479051d980be5e186926dd53233a76dfe357a455387646befca76/summary
• sqlite3_64.dll: https://www.virustotal.com/gui/file/460b8fffb74055c85469fa0598a50bbd0326d00dbfa175fb57016d7966c5e19e/summary
• unzip.exe: https://www.virustotal.com/gui/file/81046f943d26501561612a629d8be95af254bc161011ba8a62d25c34c16d6d2a/summary
• zip.exe: https://www.virustotal.com/gui/file/d73ef5858db9bb968da585546283dfab586ce11a218b0b223c0a5f0adcade7d4/summary

You'll notice that the major antivirus providers (Microsoft, Google, Avast, Kaspersky, McAfee) consider them clean, but occasionally, false-positives are reported due to limited scanning/heuristics.